Recording instrument.



D. H. HULL.

RECORDING INSTRUMENT.

APPLlCATIoN FILED SEPT.13.1912.

1,179,925. A Patented Apr. 18,1916.

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DABNEY H. HULL, OF ASYLUM, MISSISSIPPI.

RECORDING INSTRUMENT. i

Specification of LettersPatent.

Patented Apr. 18, 1916.

Application filed September 13, 1912. Serial No. 720,190.

To all whom t may concern:

Be it known that I, DABNEY H. HULL, a citizen of the United States,residingl at Asylum, in the county of Hinds and State of Mississippi,have invented certain new anduseful Improvements in RecordingInstruments, of which the following is a specification. f

My invention relates to recording instruments and has particularreference to a novel form of recording pen. i

An important object of this invention is to provide a recording penwhich is simple in construction, reliable in operation and cheap tomanufacture.

A further object of my invention is to provide a recording pen of theabove mentioned character having means for holding a large amount of inkwhich is properly fed to the pen point, whereby the device will operatecontinuously for a long time.

Other objects and advantages of the invention will be apparent duringthe course of the following description.

In the accompanying drawings forming a part of this specification and inwhich like numerals are employed to designate like parts throughout thesame, Figure 1 is a side view of an engine indicator showing my improvedrecording pen applied thereto, Fig. 2 is a side view of the recordingpen removed, Fig. 3 is asimilar view of a slightly different form ofrecording pen, and, Fig. f1 is a central vertical longitudinal sectionalview through the same.

In the drawings wherein is illustrated a preferred embodiment of myinvention, the numeral 5 designates a suitably supported stationary bodvportion, upon which is pivotally mounted a drum G, having its lowerportion engaged by a cable 7 which turns the drum for a completerevolution in one direction. A suitable spring (not shown) returns thedrum G to its normal position when the cable is released, which occursupon the back stroke of the piston. A record leaf (not shown) issuitably mounted upon the drum 6.

Rigidly connected with the stationary body portion 5 is a cylinder 8,having communication with the engine cylinder through the medium of apipe (not shown). It is thus seen that when a charge is exploded in theengine cylinder, the pressure is conducted through the pipe to thecylinder 8. Mounted to reciprocate within this cylinder is a springpressed piston (not shown), which is connected with an upwardly eX-tending piston rod 9. The piston rod 9 is pivotally connected with anindicator arm 10, which is pivotally connected at one end with avertically swinging supporting arm 11. Pivot-ally connected with theindicator arm 10 is alink 12, having one end pivoted with a stationarysupport 13, as shown. At its free end the indicator arm 10 is providedwith an enlarged apertured head 14.

My improved recording pen comprises a tubular body portion l5, which isinserted through the apertured head 14 and held against displacement byclamping bolt 16. buitably mounted upon one end of the tubular bodyportion 15 is a contracted tapered tip or point 17 provided at its eX-treme end with a small orifice 18. Connected with the opposite end ofthe tubular body portion 15 is a flexible hose 19, connected with areservoir or tank 20, holding the ink. This reservoir is rigidly mountedupon a stationary vertical post 21.

In Figs. 3 and 4: I have shown a different form of recording pen. Inthese figures the numeral 22 designates a tubular body portion, which isadapted for insertion through the apertured head la and is held againstdisplacement by the clamping bolt 23. rIhe tubular body portion 2Q hasits opening 24- tapered toward its forward end, as clearly shown in Fig.Suitably mounted upon one end of the tubular body portion 22 is atapered tip or point 2o, provided at its extreme end with a smallorifice Q6, which leads into an enlarged chamber 27, having freecommunication with the opening 24. Suitably mounted upon the oppositeend of the tubular body portion 22 is a main reser voir or tank 28,having communication with the tubular body portion 22 through the mediumof a port 29.

The operation of the device is as followsz-At the same time thatpressure is introduced into the cylinder 8, the cable 7 turns the drum6. The point 17 engages the record sheet and draws the desired curve. Ihave found that the operation of the recording pen, (shown in Figs. 3and 4) is particularly advantageous, as the ink is supplied to theorifice 26 evenly and continuously, whereby a smooth regular curve isdrawn. It is believed that the successful operation of this form ofrecording pen is due to the employment of the enlarged CII chamber 27 incombination with the other elements. It is essential that the severalelements be readily separable so that they may be cleaned of the driedor thickened ink. It is also important that the connection between thetubular body portion and swinging arm be strong and rigid.

It is to be understood that the forms of my invention herewith shown anddescribed are to be taken as preferred examples of the same and thatcertain changes in the shapes, sizes and arrangement of parts may beresorted to without departing from the spirit of my invention and thescope of the subjoined claim.

Having fully described my invention, I claim The combination with atubular head open at both ends and serving as a support, of a tubemounted therein and extending at both ends a substantial distance beyondthe ends of the head, means to clamp the tube in place within the head,a tubular point provided at its inner end with a counterbore forreceiving one end of the tube and engaging the head at a pointsubstantially inwardly spaced from the free end of the tube whereby thetube overlaps the juncture between the tubular point and head, and asupply receptacle provided with a tubular neck having a counter-bore toreceive the opposite end of the tube and engaging the opposite end ofthe head at a point sub'- stantially inwardly spaced from the last namedend of the tube whereby said tube overlaps the juncture between thetubular neck and head.

In testimony whereof I aix my signature in presence of a witness.

DABNEY H. HULL. Witness:

LAURA LU Lo'r'r.

Copies of this patent may be obtained for ve cents each, by addressingthe "Commissioner of Patents, Washington, D. C.

